主要是在java的implements层中进行转换逻辑的书写
 

//id是前台ajax传来点击的表格
编号值
//采用java8 Stream流
 public boolean  exchageTableSotred(String  id){

       //获取priority进行重新排序
        List<StockEntity> allStockList = stockRepository.findAll();

        Optional<StockEntity> obj = stockRepository.findByDishId(dishId);
        if (obj.isPresent()) {
            int currentPriority = obj.get().getPriority();
            //如果用户选择的是从未插队多的菜品
            if (currentPriority == 0) {
                this.setNextPrepareDish(dishId);

            }
            //如果用户选择的是已经在排队的菜品，需要将priority重排
            List<StockEntity> ordersReloadList = new ArrayList<>();
            Map<Boolean, List<StockEntity>> partitionMap = allStockList.stream().collect(Collectors.partitioningBy(s -> currentPriority > (s.getPriority())));
            partitionMap.get(true).stream().forEach(a -> a.setPriority(a.getPriority() + 1));
            //前置第一位的菜品在false条件中
            StockEntity fisrstDish = partitionMap.get(false).stream().filter(a -> a.getPriority() == currentPriority).limit(1).collect(Collectors.toList()).get(0);
            fisrstDish.setPriority(1);
            ordersReloadList.addAll(partitionMap.get(true));
            ordersReloadList.add(fisrstDish);
            ordersReloadList.addAll(partitionMap.get(false).stream().filter(a -> a.getPriority() != currentPriority).collect(Collectors.toList()));
            stockRepository.saveAll(ordersReloadList);
            return true;
        }
        return false; 
}